Yes, I have plans to upgrade the upload dialog to ExtJS 3.0, actually I'm going to create more robust upload solution, I'm going to divide the dialog into three independent components: upload queue, upload panel, and upload dialog. But as usual I'm short of time, the extension might be ported at the end of August.

Donations are always welcome of course, but right now I'm just busy with two other projects. There is a message in UploadDialog 2.x thread, bjt succeeded in porting the extension to ExtJS 3x, try use it until I have time to port by myself.